Searching for charged lepton flavour violation with the Mu3e experiment -- Pixel Sensor

通过 Mu3e 实验寻找带电轻子味道违规行为——Pixel Sensor

基本信息

项目摘要

The main goal of the Mu3e Phase I experiment is the search for the charged lepton flavor violating decay gamma -> e e e with a sensitivity of BR(gamma -> e e e)< 5 × 10−15 at 90% confidence level (CL), corresponding to a factor 200 improvement compared to the existing bound. High precision tracking is required to suppress the large background for muon stopping rates up to 10^8 muons per second. The position and momentum of electrons will be measured by means of a four layer pixel tracking detector (PTD) which exploits High-Voltage CMOS Monolithic Active Sensors (HV-MAPS). The high rate of background determines the requirements on the tracking detector system and the pixel sensor. The pixel sensor has to provide high position resolution, good time resolution, low power consumption and high rate capability. In addition, the pixel sensor should be as thin as possible since the thickness determines the amount of multiple Coulomb scattering in the detector and also the rate of Bhabha scattering.For the Mu3e experiment, a dedicated HV-MAPS sensor, the MuPix has been developed over many years. MuPix is a fully monolithic sensor which integrates on-chip digital readout. The MuPix sensor is close to production readiness and the production, qualification, commissioning and calibration of final sensor is main subject of the PIX project.
Mu3e第一阶段实验的主要目标是寻找违反衰变γ -> e e e e的带电轻子风味,其灵敏度为BR(γ -> e e e)< 5 × 10−15,在90%置信水平(CL)下,与现有界相比,相应的提高了200倍。为了抑制μ子停止率高达10^8 μ子/秒的大背景,需要高精度的跟踪。电子的位置和动量将通过利用高压CMOS单片有源传感器(HV-MAPS)的四层像素跟踪探测器(PTD)来测量。高背景率决定了对跟踪探测器系统和像素传感器的要求。像素传感器必须提供高位置分辨率、高时间分辨率、低功耗和高速率能力。此外,像素传感器应尽可能薄,因为厚度决定了探测器中多重库仑散射的数量,也决定了巴巴散射的速率。对于Mu3e实验,一个专用的HV-MAPS传感器,MuPix已经开发了多年。MuPix是一个集成了片上数字读出的全单片传感器。MuPix传感器已接近生产准备阶段,最终传感器的生产、鉴定、调试和校准是PIX项目的主要课题。

项目成果

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Professor Dr. Ivan Peric其他文献

Professor Dr. Ivan Peric的其他文献

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